Microsoft announced in early April three new smartphones that would be launched on the market with Windows Phone 8.1 onboard. However, these are definitely enough to keep customers interested in Windows Phone until the end of the year.

This is one of the main reasons the Redmond-based company plans to release additional handsets in the coming months.

There have been a few rumors about some unannounced Windows Phone 8.1 devices that leaked after Microsoft launched the Lumia 630, 635 and 930, but as we’re getting closer to their reveal, we’re getting more info.

The latest device leaked via GFXbench is Nokia RM-1027, which is supposed to be the spiritual successor of the Lumia 520, the most popular Windows Phone handset on the market.

As GSMDome points out, given the smartphone’s poor specs, this can only be the sequel to the cheapest Windows Phone handset. Spotted by Chinese blog site ithome, Nokia RM-1027 appears listed with a display that supports 480 x 800 pixels resolution.

It’s also confirmed to be powered by an Adreno 305 graphics processing unit, which is usually included along with dual-core processors. Nothing else is revealed by the GFXBench listing, but we expect more details to appear soon, so stay tuned.